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i just bought a 13 m6 with 24k so i get it.
I did a DINAN stage 2 and removed the muffler and cats. It sounds exactly like i hoped it would. Even the wife likes it. sounds aggressive but not over the top.
removed your carbon filter out of each airbox and drop in a KN and call it a day.
This car is scary fast at this point. (at least to me)
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